I've been wanting the Makita 10" sliding cordless, but the close to $600 price is off putting (older model with batteries is the same as the newer model with bluetooth and no batteries). The 7 1/2 makita is right around the same price. I can get the bare tool 7 1/4 dewalt for less than $250. Plus I'm looking for light weight and portable. So I'm leaning to one of the 7 inchers.
The blue tooth isn't that important to me honestly. The Makita cordless bluetooth DCs are way too pricey. And I'm most likely getting the Bosch VAC090AH for my primary dust collector. I have the CT- SYS right now.
I have looked at the Milwaukee, and have used some of my partners 18v tools and really liked them. I suppose I could get into the Milwaukee battery system, as of right now on my makita tracksaw is my only cordless Makita.
So I have a lot to think about, but I do think I'll stick with a 7 1/4 sized saw. It will cut 95% of what I would need, and I have my tank of a 12" to cut things like 4x4 posts.
DeWalt
Pros: least expensive
Can buy almost anywhere including the big box stores.
Already have 20v Max batteries.
Milwaukee
Pros: inexpensive,can be picked up locally at HD.
Cons: do not have any other 18v batteries or tools
Makita
Pros: excellent quality, excellent factory blade
Already have 4x 5.0ah batteries from my tracksaw
Better dust collection than most miter saws
Cons: most expensive. Unique sized blades but can use standard 7 1/4.
The Metabo looks great, but I haven't found a place to purchase other than Ebay. Seems to be more available in Europe than in the US